Claude is now officially inside Microsoft Copilot. Microsoft and OpenAI have been inseparable since 2019 but that era is quietly coming to an end. In fact, this move signals the clearest sign yet that Microsoft is done relying on a single AI partner to win the AI agent war.
What Microsoft Just Did to Its Own OpenAI Partnership
To understand what changed, you need to know what Wave 3 actually is. Wave 3 marks a new version of Microsoft 365 Copilot that moves beyond assistance to agentic capabilities, meaning AI that completes work on your behalf.
At the center sits Copilot Cowork, a cloud-based AI agent that executes multi-step tasks across Microsoft 365 apps, built in collaboration with Anthropic. In other words, Microsoft built its most ambitious AI product on a competitor’s model.
Why Microsoft Chose Claude Over GPT for Its AI Agent War
Rather than doubling down on OpenAI, Microsoft struck a deal where Anthropic agreed to buy over $30 billion of Azure cloud capacity, repositioning Claude for Copilot customers.
More importantly, all the push Microsoft needed happened earlier in the year. Anthropic’s Claude Cowork launch in January 2026 triggered a $285 billion selloff in enterprise software stocks while Microsoft’s shares dropped 14%.
How Microsoft Is Winning the AI Agent War With Claude
However, Microsoft is not simply repackaging Anthropic’s product. Microsoft’s version runs in the cloud within a customer’s Microsoft 365 tenant. It is protected by enterprise data security and integrated with Work IQ, an intelligence layer built from a user’s emails, files, and meetings.
In contrast, Anthropic’s Claude Cowork runs locally on a user’s device. As Microsoft’s CMO Jared Spataro put it, “What Anthropic has done is demonstrate the value of agentic capabilities. Microsoft is all about commercialization.”
The Pricing and What Enterprises Are Actually Getting
Beyond the headline feature, the commercial packaging matters too. Microsoft announced a new $99 per user Microsoft 365 E7 tier launching May 1.
Specifically, it bundles Copilot, identity management tools, and a new $15 Agent 365 product. For enterprises already locked into Microsoft, that bundle makes a serious case for staying put.
What This Means for OpenAI
Nevertheless, OpenAI remains the elephant in the room. The 2019 partnership has entered a new phase, with OpenAI free to commit compute elsewhere and Microsoft free to pursue new AI partnerships.
As a result, Claude now sits alongside OpenAI models in Copilot Chat, with Copilot automatically choosing the right model for each task. Simply put, Microsoft is no longer betting on one horse.
Where the AI Agent War Goes Next
Right now, the Copilot Cowork is currently in research preview with broader access through Microsoft’s Frontier program expected in late March 2026.
Currently, the most important question is whether Microsoft will keep the product updated because they have a tendency to launch boldly and then go quiet.
For now, the message from Redmond is clear. When it comes to winning the AI agent war, vendor loyalty is a luxury Microsoft can no longer afford.
